The simplest outline shader (canvas_item)

Simple outline shader. Does not work with pixel art and requires partly transparent pixels around the character.

https://www.youtube.com/watch?v=EU022XHDOHw&t=56s

# Learn how to create 2D shaders like these

Want to master 2D shaders? Learn how to create stunning effects like these and more by gaining a deep understanding of the GDShader language in Godot:

https://godot2dshaders.com/

# Credits sprite

Credits to the creator of this cool necromancer sprite!

https://creativekind.itch.io

Shader code

shader_type canvas_item;

uniform vec3 outline_c: source_color;
uniform float progress: hint_range(0.0, 1.0);

void fragment() {
  COLOR = mix(COLOR, vec4(outline_c,  COLOR.a), progress - COLOR.a * progress);
}